Java aptitude interview questions * This all code GitHub link --> click here 1. checkAnagram: This method checks if two strings are anagrams or not. It takes two strings as input and returns a String indicating if they are anagrams or not. 2. checkPlindrom: This method checks if a string is a palindrome or not. It takes a string as input and returns a boolean value indicating if it is a palindrome or not. 3. factorial: This method calculates the factorial of a number using recursion. It takes an integer as input and returns its factorial. 4. fibonacci: This method generates the fibonacci series up to a certain number. It takes an integer as input and returns an array containing the fibonacci series. 5. perfectNumber: This method checks if a number is a perfect number or not. It takes an integer as input and returns a boolean value indicating if it is a perfect number or not. 6. amstrong: This method checks if a number is an Armstrong number or not. It takes an integer as i...